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> The amount of soil excavated is over 10 cubic kilometers, equivalent to 4,000 great pyramids of Giza ...

> he mounds are extremely old--up to 4,000 years

Soo they can build 1 Pyramid of Giza per year ? :D

Maybe faster. Their "building" capacity might have been growing with time.

I feel like this could be the prelude to a high school math question on exponential growth.

> Soo they can build 1 Pyramid of Giza per year ? :D

Depends if they unionize or not. (ducks)